c² = 9, The square of a number is nine., 2w = 10, Twice a number is ten., 5k = 25, Five times a number is twenty-five., x + 7 = 15, Seven more than a number is fifteen., x + 2 = 8, A number increased by two is eight., 2x + 9 = 21, Nine more than twice a number is twenty-one., 7d = 49, Seven times a number is forty-nine., a² + b² = 25, The sum of the squares of the two numbers is twenty-five., ab = 27, The product of two numbers is 27

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